Double promotions are unnecessary, there is no need for a person with an appointment to be promoted ASAP once receiving the position. This is one of my greatest beefs with the ideology many Cadets follow. A rank, and a position/appointment are 2 entirely different things. I was an RSM when I was a WO.... (for 1 week) As a DSM you can be ANY rank, Private, Corporal, Clodhopper, it really does not matter. You exercise the authority of your position as required, you just may not have direct 'control' (bad word, sorry) of others w/i the unit at all times like you would as a person of higher rank status.
A triple promotion from Sgt to CWO is the dumbest thing I have ever heard, no disrespect intended but if that individual was all that they would have had no bones about being a WO and MWO for at least a short period of time. When I see and work with units that feel it a neccessity to bounce people up that quickly I loose confidence in their training department, and leadership.